Question 1131423
<pre>
Father     w+3
Mother     w
Child      w/2
Total       100
</pre>
{{{(w+3)+w+w/2=100}}}

{{{2w+w/2=97}}}

{{{4w+w=194}}}

{{{highlight_green(w=38.8)}}}

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<pre>
Father     41.8
Mother     38.8
Child      19.4
Total       100
</pre>


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"father is 3 years older than his wife,..."


If the problem said father were 5 years older than his wife, then
{{{w+5+w+w/2=100}}},...
and the results would be whole numbers.
Father, 41
Wife, 38
Child, 19